Solid shot bit



Patented a... 9, 1925.

UNITED STATES PATENT ornca.

011mm 0. nansnn,

01 EASTON, PENNSYLVANIA, ASSIGNOR 'I'O INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

SOLID SHOT BIT.

Application filed April 11, 1925. Serial No. 88,356.

To all whom it may concern:

Be it known that I, CHARLES C. HANSEN a citizen of the United States, a resident of Easton, county of Northampton, and State of Pennsylvania, have invented a certa n Solid Shot Bit, of which the following 18 a specification, accompanied by drawings.

This invention relates to shot bits, but more particularly to shot bits employed for rotary drilling in deep wells and where the formin of a core is not essential. Drill bits using steel shots as abrasive material have been employed with marked success in core drilling. It has been found that if a core is not required for analytical or other purposes, a solid bit. constructed in accordance with this invention usin shot or other abrasive, may be employe with equal success in deep hole drilling, and that the initial expense of such a bit is not only comparatively low, but that the maintenance expense is practically negligible.

The principal object of this invention 1s to enable rock to be drilled with a solid rotary drill, bit using shot as an abrasive material.

Other objects will be in part obvious and in part pointed out hereinafter.

In the accompanying drawings, illustrating the invention in a preferred form,

Figure 1 is a vertical view partlyin section of a solid shot bit for a rotary drill,

and

Figure 2 is an end view of Figure 1 looking in the direction of the arrows.

Referring to the drawings, a bit A is shown attached to a cylindrical hollow spindle B by meansof a coupling C. The spindle B and the'coupling C are preferably of substantially the same diameter as the bit A.

The cutting or grinding end D of the bit A is in this instance convex and a concave depression E is provided in the opposite end of the bit to receive an abradent, such as the steel shot F, and to direct the shot to an aperture G, said aperture extending through the center of the bit and serving as a passage for the shot F and water H to the grinding face D. A lurality of grooves J of suitable depth an width are formed in the periphery of the bit and extend longitudinally thereof to a point near the juncture of a shoulder K of the bit and the coupling 0. I

The grooves J are in communication with the central aperture G through a suitable slot L in the grinding face D, while an auxiliary slot 0 is in this instance arranged perpendicularly to the slot L to serve as a supply chamber for the shot F.

In operation, water under pressure and shot are introduced into the chamber P of the spindle B, from whence they pass through the a erture G to the slots L and O. The bit is in this instance adapted to move in a clockwise direction (looking down, Figure 1) and as the bit rotates the shot are caught under a chamber Q in one side of the grooves J and the drill passes over the shot, and since the shot are considerably harder than the bit they become embedded in the grindin face D and wear away the material whicfi is being drilled. The shot also pass upwardly through the grooves J and become embedded in the periphery of the bit as shown at R. The diameter of the drill hole S is therefore somewhat greater than the diameter of the bit which permits the drill and associated parts to rotate within the hole without undue friction.

The clearance thus formed is also utilized in removing cuttings from the drill hole. As the water used for cleaning the hole is under pressure, it passes though the aperture G and under the grinding face D of the bit A, thence carrying the cuttings upwardly through the hole S to the surface. In this way the cutting face is at all times clean and since the specific gravity of the shot is greater than that of the cuttings, the water pressure may readily be regulated so that only the cuttings are removed while the shot remain in the bottom of the drill hole.

I claim:

1. A drill comprising a solid bit, and a hollow cylindrical spindle connected to the bit having a convex grinding face at one end and at its other end a concaved depression for directing shot to the center of the bit, said bit also having an aperture through its center and a plurality of longitudinal rooves in its periphery, and slots arrange erpendicularlv in the convex face whereby t e central aperture communicates with the longitudinal grooves for the passage of shot and water to the convex grinding face and to the periphery of the bit.

2. A drill com rising a solid bit, and a hollow oylindrioa spindle removably connected to the bit having a, convex grinding face at one end and at its other enda conoaved depression for directing shot to the center of the bit, said bit also having an aperture throu h its center and a plurality of Ion itu lnal grooves in its periphery, and s ots arranged perpendicularlv in the convex face whereby the central :1 er- 10 ture communicates with the longitudinal grooves for the passage of shot and-water to the convex grlnding face and to the'periphery of the bit.

In testimony whereof I have signed this specification CHARLES C. HANSEN. 

